Databases not displayed for several users

I have a problem on my machine. After an update to 7.5.2 some of my users are complaining that they can't lookup for their database using the plesk webbases manager. The databases do exist. Websites are running fine but the plesk manager is unable to show them. (user clicks on the menu databases.. all empty).

Anyone can tell me how to fix this or link all the databases back to the correct users?